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Move spill related functions to spill.rs (#11509)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
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| //! Defines the spilling functions | ||
| use std::fs::File; | ||
| use std::io::BufReader; | ||
| use std::path::{Path, PathBuf}; | ||
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| use arrow::datatypes::SchemaRef; | ||
| use arrow::ipc::reader::FileReader; | ||
| use arrow::record_batch::RecordBatch; | ||
| use log::debug; | ||
| use tokio::sync::mpsc::Sender; | ||
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| use datafusion_common::{exec_datafusion_err, Result}; | ||
| use datafusion_execution::disk_manager::RefCountedTempFile; | ||
| use datafusion_execution::memory_pool::human_readable_size; | ||
| use datafusion_execution::SendableRecordBatchStream; | ||
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| use crate::common::IPCWriter; | ||
| use crate::stream::RecordBatchReceiverStream; | ||
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| /// Read spilled batches from the disk | ||
| /// | ||
| /// `path` - temp file | ||
| /// `schema` - batches schema, should be the same across batches | ||
| /// `buffer` - internal buffer of capacity batches | ||
| pub fn read_spill_as_stream( | ||
| path: RefCountedTempFile, | ||
| schema: SchemaRef, | ||
| buffer: usize, | ||
| ) -> Result<SendableRecordBatchStream> { | ||
| let mut builder = RecordBatchReceiverStream::builder(schema, buffer); | ||
| let sender = builder.tx(); | ||
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| builder.spawn_blocking(move || read_spill(sender, path.path())); | ||
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| Ok(builder.build()) | ||
| } | ||
|
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| /// Spills in-memory `batches` to disk. | ||
| /// | ||
| /// Returns total number of the rows spilled to disk. | ||
| pub fn spill_record_batches( | ||
| batches: Vec<RecordBatch>, | ||
| path: PathBuf, | ||
| schema: SchemaRef, | ||
| ) -> Result<usize> { | ||
| let mut writer = IPCWriter::new(path.as_ref(), schema.as_ref())?; | ||
| for batch in batches { | ||
| writer.write(&batch)?; | ||
| } | ||
| writer.finish()?; | ||
| debug!( | ||
| "Spilled {} batches of total {} rows to disk, memory released {}", | ||
| writer.num_batches, | ||
| writer.num_rows, | ||
| human_readable_size(writer.num_bytes), | ||
| ); | ||
| Ok(writer.num_rows) | ||
| } | ||
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| fn read_spill(sender: Sender<Result<RecordBatch>>, path: &Path) -> Result<()> { | ||
| let file = BufReader::new(File::open(path)?); | ||
| let reader = FileReader::try_new(file, None)?; | ||
| for batch in reader { | ||
| sender | ||
| .blocking_send(batch.map_err(Into::into)) | ||
| .map_err(|e| exec_datafusion_err!("{e}"))?; | ||
| } | ||
| Ok(()) | ||
| } |